Cranking pressure on competition 4v engines

Cranking pressure on competition 4v engines

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Discussion

anonymous-user

53 months

Tuesday 16th September 2014
quotequote all
I think Pumas been having a wee dram a little earlier than usual today....... ;-)

Pumaracing

Original Poster:

2,089 posts

206 months

Tuesday 16th September 2014
quotequote all
Max_Torque said:
I think Pumas been having a wee dram a little earlier than usual today....... ;-)
There's nae sich thing as too early fae a dram. It starts the day aff just fine and fortifies the spirit.

anonymous-user

53 months

Tuesday 16th September 2014
quotequote all
Pumaracing said:
Max_Torque said:
I think Pumas been having a wee dram a little earlier than usual today....... ;-)
There's nae sich thing as too early fae a dram. It starts the day aff just fine and fortifies the spirit.
I know what you mean laddy, i can get pretty cranky when under pressure without a dram or two (<<< see what i did there ;-)

Stan Weiss

260 posts

147 months

Sunday 18th January 2015
quotequote all
Dynamic CR and Cranking Compression (PSI) are very closely related.

From bore, stroke, rod length, static CR and cranking PSI you should be able to calculate both DCR and IVC @ the valve.

I like to use IVC @ the valve because lash changes will change IVC and this will cause your PSI to change.

If you can also include air density changes to see what happens to psi.

Stan